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Pronunciation
Definition 1
A substance (such as a radioisotope) used in imaging procedures. (NCI Dictionary)
Definition 2
A substance that is identifiable by virtue of its radioactive signature, color, or other distinguishing physical property, such as a dye, radioactive isotope, or inert chemical, that is introduced into a biological or mechanical system and can be followed through the course of a process, providing information on the pattern of events in the process or on the redistribution of the parts, elements, or events involved. (NCI Thesaurus)
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